Branched polycarbonate resin
US6222004A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2000 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | May 26, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A tetrahydric phenol having a specific structure, such as .alpha.,.alpha.'-dimethyl-.alpha.,.alpha.,.alpha.',.alpha.'-tetrakis(4-hyd roxyphenyl)-p-xylene, is used as the branching agent in producing a branched polycarbonate resin. The resin has a branching agent content (branching agent/(dihydric phenol+chain terminator+branching agent).times.100) of from 0.01 to 0.4 mol %, and an intrinsic viscosity [.lambda.] of from 0.5 to 0.6, and is substantially free from crosslinks. The resin has such a reduced branching agent content and has good melt characteristics including high melt tension. It exhibits improved moldability in blow molding, etc., and gives good moldings especially having improved appearances and color tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.